Collar



FIG. 1 is a front perspective view of a collar showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines showings represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a collar, as shown and described. 